Liquid/gas vacuum ejector device

ABSTRACT

This invention relates to the area of jet technology, primarily to liquid/gas ejector devices used for the creation of a vacuum. The technical problem, solved by the invention, is the increase of the coefficient of efficiency of the liquid/gas vacuum ejector device. This problem has been solved by this invention due to the optimization of the process of mixing gas and liquid media. This has been achieved due to the optimization of mixing gas and liquid media in the mixing chamber of the liquid/gas vacuum ejector device, containing an active nozzle (1) and a mixing chamber (2), the area of the minimal section of the latter being 201 to 800 times the area of the minimal section of the active liquid nozzle (1), and the ratio of the distance from the outlet section of the mixing chamber (2) to the outlet section of the active nozzle (1) to the diameter of the minimal section of mixing chamber (2) is in the range from 10 to 300.

BACKGROUND OF THE INVENTION

This invention relates to the area of jet technology, primarily toliquid/gas ejector devices used for the creation of vacuum.

From prior level of technology, liquid/gas ejector devices, containingand active nozzle, receiving chamber, mixing chamber, diffuser and jets,delivering active and passive media are known (see, for instance: R. P.Shurnsky "Vacuum apparatuses and devices," M., Mashgiz, 1963, p.476-477).

The drawback of the known ejector devices is the comparatively lowcoefficient of efficiency. This narrows down the area of applicabilityof these devices.

The closest analogy, selected by the authors as the prototype of thisinvention, is the liquid/gas ejector device, containing an active nozzleand a mixing chamber with diffuser. The optimal ratio of the sizes ofthe mixing chamber and the active nozzle shall be determined from acalculated expression, depending on the ratio of the drop of pressure inthe mixture of media and the active liquid medium (see. for instance,the book of Sokolov E. Ya. et al. "Ejector devices", M., Energiya, 1970,p. 209)

Performed tests proved that the ejector devices described above do notprovide for the needs in ejector devices. For instance, in theprocessing of hydrocarbon raw materials, productivity and depth ofvacuum, is characterized by comparatively big energy losses in theprocess of the mixture of media in the ejector device.

SUMMARY OF THE INVENTION

This invention is aimed at the increase of the coefficient of efficiencyof the liquid/gas vacuum ejector device.

This problem has been solved in this invention due to the optimizationof the process of mixing gas and liquid media.

In accordance with the invention, the optimization of the process ofmixing gas and liquid media is achieved by the liquid/gas vacuum ejectordevice, containing an active nozzle and a mixing chamber. In the vacuumejector device, the area of the minimum cross-section of the mixingchamber amounts to 201 to 800 times the area of the minimumcross-section of the active liquid nozzle. Additionally the ratio of thedistance between the outlet cross section of the mixing chamber and theoutlet cross section of the active nozzle to the diameter of the minimalcross-section of the chamber is in the range of 10 to 300.

The conducted experiments proved considerable influence on the value ofthe coefficient of efficiency by the ejector component of the device forthe mixing of active--liquid and passive--gas media. For this reason theoptimization of the size of the mixing chamber and of the size of theejector device is of great importance. Optimization of these twoelements will increase the efficiency of the creation of a vacuum.

The production of the vacuum ejector device with the ratio of the sizes,indicated above, creates a homogenous gas-liquid, at the outlet of thechamber. At this point the processes of condensation and dissolution ofthe component of gas medium would practically be completed. As such, theenergy losses in the process of the mixing of media are minimized.Consequently, the losses of energy related to the impact of the jet ofliquid on the walls of the mixing chamber will be reduced, along withthe hydraulic losses due to friction.

These features of the device will provide for the achievement of thetechnical objective set forth--that is, the increase of the coefficientof efficiency of the liquid/gas ejector device.

The following is the detailed description of the invention with anexample of its realization.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view with a break line representing the describedliquid-gas vacuum ejector device.

FIG. 2 is a view taken along line 2--2 of FIG. 1

DETAILED DESCRIPTION OF THE INVENTION

Liquid/gas vacuum ejector device contains an active liquid nozzle 1mixing chamber 2, and diffuser 3. The area of the minimal cross-sectionof the mixing chamber 2 (having diameter dmc) represents from 201 to 800areas of the minimal cross-section of the liquid nozzle 1 (havingdiameter dn). Stated alternatively, the cross-sectional area of themixing chamber 2 is 201-800 times larger than the cross-sectional areaof liquid nozzle 1 (i.e. 201<dmc² /dn² <800). This differential helps tocreate the desired mixing chamber characteristics.

Additionally, there is a predetermined distance L between the outletsection of liquid nozzle 1 and the outlet section of chamber 2. Theratio of distance L to the diameter (dmc) of the minimum cross-sectionof mixing chamber 2 is in the range of 10 to 300. Stated alternatively,the ratio of the distance between the outlet cross-section of the mixingchamber 2 and the outlet cross-section of the active nozzle 1 to thediameter of the minimal cross-section of mixing chamber 2 is from 10 to300 (i.e. 10≦L/dmc≦300).

As is well known, the configuration and dimensioning of all thesecomponents helps to optimize their particular independent operation. Byoptimizing their relational dimensions, the overall operation of thedevice is maximized.

The ejector device works as follows

Active liquid media, flowing from nozzle 1, sweeps the mixed passive gasmedia into chamber 2. From mixing chamber 2 the mixture of the mediaproceeds into diffuser 3, where the kinetic energy of the mixture ofmedia is partially transformed into potential energy of pressure.

The invention may be applied in branches of industry, using a vacuum inthe production processes, for instance, in chemical, food and a numberof other industries.

We claim:
 1. A liquid-gas vacuum ejector device, comprising an activeliquid nozzle (1) and a mixing chamber (2), where a ratio of the area ofthe minimal cross-section of the mixing chamber (2) to the area of theminimal cross-section of the active liquid nozzle (1) is within therange of 201 to 800; and where a ratio of the distance from the outletcross-section of the mixing chamber to the outlet cross-section of theactive nozzle (1) to the diameter of the minimal cross-section of themixing chamber (2) is within the range of 10 to
 300. 2. The liquid-gasvacuum ejector device of claim 1 further comprising a diffuser attachedto the mixing chamber.
 3. The liquid-gas vacuum ejector of claim 1wherein the mixing chamber is substantially cylindrical.
 4. A liquid-gasvacuum ejector device, comprising an active liquid nozzle (1) having anoutlet and a minimal cross section and a mixing chamber (2) having anoutlet and a minimal cross section, where a ratio of the area of theminimal cross-section of the mixing chamber (2) to the area of theminimal cross-section of the active liquid nozzle (1) is within therange of 201 to 800; and where a ratio of the distance from the outletcross-section of the mixing chamber to the outlet cross-section of theactive nozzle (1) to the diameter of the minimal cross-section of themixing chamber (2) is within the range of 10 to 300.